Adam Smith หรือบิดาแห่งเศรษฐศาสตร์ได้กล่าวไว้ว่า
“In what constitutes the real happiness of human life, they are in no respect inferior to those who would seem so much above them. In ease of body and peace of mind, all the different ranks of life are nearly upon a level, and the beggar, who suns himself by the side of the highway, possesses that security which kings are fighting for.”
-Adam Smith , The Theory of Moral Sentiments